NOVA stopped Populate the Compute databases with WARNING: cell0 mapping not found - not syncing cell0.

su -s /bin/sh -c "nova-manage db sync" nova

WARNING: cell0 mapping not found - not syncing cell0.

Then there is no output after hours.

I checked the MariaDB and there is no table for nova:

MariaDB [(none)]> use nova

Database changed

MariaDB [nova]> show tables

-> ;

Empty set (0.00 sec)

I have been following the install guide for Netwon ( https://docs.openstack.org/newton/install-guide-rdo/nova-controller-install.html (https://docs.openstack.org/newton/ins...)), but it looks the controller box didn't do anything even command keyed in. Is there any way to fix it and continue the installation?